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| author | Ganesh Mahendran <opensource.ganesh@gmail.com> | 2014-12-12 16:57:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-13 12:42:50 -0800 |
| commit | df8b5bb998f10cfc040ad30300f9a9ea4592ff82 (patch) | |
| tree | 43d3c41069a79d68b507701aef4e9ffbb68c6a76 /mm/zsmalloc.c | |
| parent | d49b1c254c997195872a9e8913660a788298921e (diff) | |
| download | linux-stable-df8b5bb998f10cfc040ad30300f9a9ea4592ff82.tar.gz linux-stable-df8b5bb998f10cfc040ad30300f9a9ea4592ff82.tar.bz2 linux-stable-df8b5bb998f10cfc040ad30300f9a9ea4592ff82.zip | |
mm/zsmalloc: avoid duplicate assignment of prev_class
In zs_create_pool(), prev_class is assigned (ZS_SIZE_CLASSES - 1) times.
And the prev_class only references to the previous size_class. So we do
not need unnecessary assignement.
This patch assigns *prev_class* when a new size_class structure is
allocated and uses prev_class to check whether the first class has been
allocated.
[akpm@linux-foundation.org: remove now-unused ZS_SIZE_CLASSES]
Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Reviewed-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/zsmalloc.c')
| -rw-r--r-- | mm/zsmalloc.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 61e180931ca8..2021df5eb891 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -155,8 +155,6 @@ * (reason above) */ #define ZS_SIZE_CLASS_DELTA (PAGE_SIZE >> 8) -#define ZS_SIZE_CLASSES ((ZS_MAX_ALLOC_SIZE - ZS_MIN_ALLOC_SIZE) / \ - ZS_SIZE_CLASS_DELTA + 1) /* * We do not maintain any list for completely empty or full pages @@ -983,6 +981,7 @@ struct zs_pool *zs_create_pool(gfp_t flags) { int i, ovhd_size; struct zs_pool *pool; + struct size_class *prev_class = NULL; ovhd_size = roundup(sizeof(*pool), PAGE_SIZE); pool = kzalloc(ovhd_size, GFP_KERNEL); @@ -1004,7 +1003,6 @@ struct zs_pool *zs_create_pool(gfp_t flags) int size; int pages_per_zspage; struct size_class *class; - struct size_class *prev_class; size = ZS_MIN_ALLOC_SIZE + i * ZS_SIZE_CLASS_DELTA; if (size > ZS_MAX_ALLOC_SIZE) @@ -1020,8 +1018,7 @@ struct zs_pool *zs_create_pool(gfp_t flags) * characteristics. So, we makes size_class point to * previous size_class if possible. */ - if (i < ZS_SIZE_CLASSES - 1) { - prev_class = pool->size_class[i + 1]; + if (prev_class) { if (can_merge(prev_class, size, pages_per_zspage)) { pool->size_class[i] = prev_class; continue; @@ -1037,6 +1034,8 @@ struct zs_pool *zs_create_pool(gfp_t flags) class->pages_per_zspage = pages_per_zspage; spin_lock_init(&class->lock); pool->size_class[i] = class; + + prev_class = class; } pool->flags = flags; |